JP2007278027A - Connection hardware - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide connection hardware capable of realizing a reduction in construction cost by reducing the amount of operations at site without lowering a member transporting efficiency in constructing a wooden building. <P>SOLUTION: This connection hardware 11 comprises a fitting plate 12 brought into contact with the side surface of a first member F to tighten the first member F to a second member S and an insertion plate 13 fitted into the groove 41 of the second member S. The length of the hardware between a contact surface 18 where the fitting plate 12 abuts on the first member F and the end of the insertion plate 13 is limited to 40 to 68 mm. Since the connection hardware is reduced in size, the transportation efficiency is kept unchanged even when the connection hardware 11 is fitted to the first member F in a plant and transported into the site by a truck, and the operations for mounting the connection hardware 11 at the site can be halved. Consequently, the construction cost can be reduced, and the strength of the hardware can also be maintained by increasing the number of fixing pins 25 in use. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a connecting hardware used when fastening a member such as a base, a pillar, or a beam in a wooden building.

  A wooden structure based on a conventional construction method forms a skeleton by combining rod-shaped members such as foundations, columns, and beams. Skeletal materials such as columns and beams are extremely important in securing the strength of a building, and sufficient rigidity is required even in a fastening portion that joins the skeleton materials together. Therefore, measures have been taken for fastening parts, such as combining hammering and punching grooves, for a long time. However, punching and punching grooves have large cross-sectional defects and are likely to cause strength problems. There are problems such as poor workability. Therefore, recently, there are increasing opportunities to use various types of linked hardware as a substitute for finishing.

Linked hardware has many advantages and is used in various fasteners. There are various shapes, but the most widespread are those obtained by bending a flat plate into a U-shape. This type of connecting hardware is used for a fastening part that joins two members in a letter shape, the central plate is in surface contact with one member, and the two plates extending from both ends of the central plate are the other It is inserted in the end surface of the member. The two plates inserted into the other member have a length of about 100 mm from the custom of those skilled in the art, and it is necessary to process a groove corresponding to this length into the member. A number of patent applications have been filed for linked hardware, and the following patent document is an example.
JP 10-33260 A

  Contractors of wooden buildings such as houses are looking for ways to reduce costs while maintaining reliability in a fierce competition. One of them is to shorten the work time at the site, and it is considered to carry out as much work as possible in factories such as sawmills. For example, the fastening of the connecting hardware and the member is conventionally performed all at the site, but if the fastening of the connecting hardware and one member is performed in the factory, the amount of work at the site can be reduced. However, since the connecting hardware is fastened so as to protrude from the member, it is impossible to arrange the members in close contact when loaded on a truck for transportation. As a result, transportation efficiency deteriorates and increases costs, and there is also a problem that cargo collapse tends to occur.

  The present invention was developed based on such a situation, and in the construction of a wooden building, it is possible to reduce the amount of work on site without lowering the transportation efficiency of members, and to reduce the cost of construction. The purpose is to provide.

  The invention according to claim 1 for solving the above problem is used in a fastening portion between a first member and a second member, and a contact plate whose contact surface is in contact with the first member; and the second member And an insertion plate that is fitted in the groove formed at a right angle and extends perpendicularly from the contact plate, and the contact plate includes a locking hole for fastening to the first member, The insertion plate is provided with a holding means for fastening with the second member, and the length from the contact surface of the contact plate to the terminal end of the insertion plate is 40 mm or more and 68 mm or less It is a hardware.

  The first member and the second member refer to two members fastened according to the present invention, both of which are rod-shaped timbers and correspond to foundations, columns, beams, and the like. Further, the present invention is suitable for use in a place where two members are fastened together in a letter shape, and a direction in which the fastening portion is a side surface is defined as a first member and a direction in which the fastening portion is a side surface is defined as a second member. However, the posture of both members is arbitrary. In some cases, the first member is a base laid horizontally, and the second member may be a column extending vertically from here, or the first member is a column and the second member is horizontal. There are a variety of cases, such as a beam extending to

  The connection hardware is a unit in which a contact plate and an insertion plate are integrated, and the insertion plate extends from the contact plate at a right angle. Here, the right angle does not mean an exact 90 degrees, and a certain amount of error is naturally allowed. And a contact | adherence board is a site | part which contacts the side surface of a 1st member, and an insertion board is a site | part inserted by the 2nd member. In addition, in the contact plate, a surface that contacts the first member is defined as a contact surface, and a groove for fitting the insertion plate needs to be processed in advance on the end surface of the second member. In addition, the specific shape of the connecting hardware can be freely selected, such as a U-shaped one with an insertion plate extending in parallel from the left and right sides of the contact plate, or an L-shape or T-shape with only one insertion plate. Etc.

  A general-purpose material such as a bolt, a nail, or a fixing pin is used to fasten both the members and the connecting hardware. Among them, since a bolt or a nail is used for fastening between the contact plate and the first member, a locking hole for inserting these is formed in the contact plate. When using a bolt here, the drill hole which penetrates the 1st member is processed beforehand, and after this drill hole and a locking hole are made to correspond, a bolt is inserted from a locking hole. Then, the first member and the coupling hardware are firmly integrated by screwing and tightening the nut to the tip of the bolt that protrudes from the opposite surface through the first member. When using a nail, it is driven toward the first member from the locking hole. Note that the locking hole is not necessarily formed directly on the contact plate.

  The holding means is formed on the insertion plate for fastening with the second member. Since the both are not integrated only by fitting the insertion plate into the groove, it is necessary to drive a fixing pin that penetrates the second member and the insertion plate, and the holding means has a role of receiving the fixing pin. The specific shape of the holding means may be a simple round hole or a groove having a semicircular tip. It is desirable to use a plurality of fixing pins from the viewpoint of stability. In addition, the second member needs to be processed in advance with a pin hole for driving the fixing pin.

  The length from the contact surface of the contact plate to the terminal end of the insertion plate being 40 mm or more and 68 mm or less restricts the maximum length of the insertion plate based on the contact surface. This range only limits the length of the contact surface in the normal direction, and the other dimensions are free. Conventionally, it has become standard for those skilled in the art to secure this length of about 100 mm, and no attempt has been made to shorten this length. However, by limiting to such a range, it is possible to efficiently reduce the cost while suppressing the influence on the strength. If the length is less than 40 mm, it is difficult to ensure the strength. Conversely, if the length exceeds 68 mm, the advantage in shape disappears.

  As in the first aspect of the present invention, when the length of the insertion plate is set to 40 mm or more and 68 mm or less, when the connecting hardware is attached to the first member, the protruding length from the first member is larger than the conventional length. Almost halved. For this reason, when the connecting hardware is loaded on the truck with the first member attached, the distance between adjacent members can be reduced, so that a reduction in transport efficiency can be suppressed. In addition, by shortening the protruding length of the connecting hardware, stable transportation without collapse of goods can be realized simply by interposing a square member with a small cross section. Therefore, it becomes possible to fasten the connecting hardware to the first member based on a stable environment in the sawmill, and the amount of work at the site can be reduced. Furthermore, when the shape of the connection hardware is U-shaped, it is necessary to insert a bolt between the two insertion plates, but the workability is greatly improved by shortening the insertion plate. In addition, since the insertion plate is shorter than the conventional one, the material cost is also reduced. Steel plates, which are used as materials for connecting hardware, tend to be expensive to maintain reliability, and material cost reduction is also important.

  By accumulating the above factors, it is possible to greatly reduce the cost of construction of wooden buildings. In addition, since the shape of the connecting hardware is not extremely changed, the method of use itself is the same as in the prior art, handling is extremely easy, and the decrease in strength is limited. Therefore, the same strength as before can be exhibited by increasing the number of fixing pins used. Although the present invention merely limits the length of the insertion plate, it is more difficult than expected to break the conventional practice that has been unconditionally followed by those skilled in the art, and is a highly unique technique.

  FIG. 1 is a perspective view showing an example of the shape of a connecting hardware 11 according to the present invention. The first member F and the second member S are both laid horizontally, the end surface of the second member S is in contact with the side surface of the first member F, and a two-membered fastening portion is constituted by both members. The The connecting hardware 11 has a U-shape when viewed from above, and the contact plate 12 is located at the center thereof, and the insertion plate 13 extends at right angles from both sides. The contact plate 12 has a rectangular shape that is long in the vertical direction, but is not a simple plate, but has three side walls 14. The tenon 14 has a hollow shape formed by an extrusion process, and is provided with a locking hole 15 by cutting out the center of its tip in a circular shape. Further, the left and right insertion plates 13 are formed with holding grooves 16 whose upper and lower sides are cut, and between the upper and lower holding grooves 16, circular holding holes 17 are formed. The holding groove 16 and the holding hole 17 are holding means for receiving the fixing pin 25 and are formed concentrically on the two insertion plates 13.

  On the side surface of the first member F, a relief hole 31 is processed in advance for fitting the relief 14 of the connecting hardware 11. As a result, the connecting hardware 11 is restrained by the first member F, the second member S can be prevented from rotating around the axis, and the rigidity of the fastening portion is further improved. However, the connecting hardware 11 can be easily removed only by fitting the horn 14 into the horn hole 31, so that the bolts 21 are integrated to prevent this. The top portion 22 of the bolt 21 is accommodated in the tenon 14, and only the tip portion 23 projects from the locking hole 15 to the outside. Further, since the first member F has a drill hole 32 concentric with the relief hole 31, the tip portion 23 of the bolt 21 reaches the opposite surface through the drill hole 32. When the nut 24 is screwed into the nut 24 and tightened, the connecting hardware 11 is firmly integrated with the first member F, and can receive various loads thereafter. In order to embed the nut 24 in the first member F, the counterbore hole 33 is also processed in advance.

  On the end surface of the second member S, grooves 41 for fitting the insertion plates 13 of the connection hardware 11 are processed in two rows in parallel, and the surface of the adhesion member 12 is accommodated between the grooves 41. A stepped portion 43 is provided by shaving. In addition, a total of four pin holes 42 are formed on the side surface of the second member S so as to penetrate the groove 41 and reach the opposite surface. Since this pin hole 42 is machined in accordance with the holding hole 17 of the connecting hardware 11, after the insertion plate 13 is fitted into the groove 41, the pin hole 42 and the holding hole 17 are aligned and fixed. When the pin 25 is driven, the second member S and the connecting hardware 11 are integrated. Therefore, the diameters of the fixing pin 25, the holding hole 17, and the pin hole 42 are equal, and the fixing pin 25 is fixed by friction with the pin hole 42.

  The length from the contact surface 18 in contact with the first member F to the origin and the end of the insertion plate 13 is in the range of 40 mm to 68 mm as shown in the figure. It is a feature. Other heights of the connecting hardware 11, presence / absence of the tenon 14, the number of holding holes 17, and the like can be freely determined without any restrictions. The holding hole 17 is preferably as close to the end of the insertion plate 13 as possible in terms of strength. If the diameter of the holding hole 17 is 12 mm, the distance between the end of the insertion plate 13 and the center of the holding hole 17 is 15 mm is optimal.

  2 supplements FIG. 1. FIG. 2A is a cross-sectional view of FIG. 1 assembled, FIG. 2B is the same vertical cross-section, and FIG. 2C is similar to FIG. This is the shape of the connecting hardware 11 to be performed. As shown in both cross-sectional views, the connecting hardware 11, the bolt 21, the nut 24, and the fixing pin 25 are entirely embedded in both members and have an orderly appearance. The length of the insertion plate 13 is limited as shown in the dimension shown in FIG. This dimension is shorter than the conventional one, and therefore the distance from the end surface of the second member S to the fixing pin 25 is also shortened. Therefore, the reliability is maintained by using a total of four fixing pins 25 (three at most in the past). In addition, the shape of the connecting hardware 11 according to the present invention is arbitrary, and the locking hole 15 may be formed directly in the contact plate 12 without the tenon 14 as shown in FIG.

  FIG. 3 shows another example of the shape of the connecting hardware 11 according to the present invention. FIG. 3A includes a single insertion plate 13, and further includes a total of two disc-shaped contact plates 12 symmetrically. A recess 34 for embedding the contact plate 12 is processed in the first member F, and a single groove 41 and four pin holes 42 are processed in the second member S. It should be noted that the bolts 21 and the fixing pins 25 are used for fastening the connecting hardware 11 and both the members F and S as in FIG. Next, FIG. 3 (B) shows a T-shaped connecting hardware 11, and an insertion plate 13 extends at a right angle from the center of the contact plate 12. Moreover, although the terminal surface of the insertion board 13 is not vertical but is inclined, the position farthest from the contact surface 18 is within the numerical range limited by the present invention. In addition, a nail 26 is used to fasten the connection hardware 11 and the first member F, and a stepped portion 43 corresponding to the contact plate 12 is processed on the end surface of the second member S, and a groove 41 is formed at the center. Has been processed.

  FIGS. 4 to 8 show the results of investigating the strength of the connecting hardware 11 according to the present invention. However, FIG. 4, FIG. 7 (A), and FIG. 8 (A) are the results at the time of using the conventional connection metal fitting for a comparison. All the members used here are made of spruce laminated material, there is little variation in strength, all the bolts are M12, and all the fixing pins have a diameter of 12 mm. In FIG. 4A, a second member S having a length of 795 mm and a height of 240 mm is arranged between two first members F each having a 105 mm square, and connecting hardware is used at both ends of the second member S. ing. The upper figure is a transverse section and the lower figure is a longitudinal section. The connecting hardware used here is a conventional type in which the length of the insertion plate 13 is 100 mm, and uses three fixing pins 25. And after fixing the lower end surface of the 1st member F, a load is added to the center of the 2nd member S, and the load at the time of a fastening part being damaged by a shear is measured as a destruction load. The result of carrying out this six times in total is shown in the table on the right. FIG. 4B also uses a conventional connecting hardware, but the height of the second member is 180 mm and the number of fixing pins 25 is two.

  FIG. 5 is the same member structure as FIG. 4 (A), but uses the connecting hardware 11 according to the present invention. 5A uses three fixing pins 25, and FIG. 5B uses four fixing pins 25. In FIG. 5A, the breaking load is lower than that in the conventional case, but FIG. 5B shows the same breaking load as in the conventional case. Therefore, by increasing the number of the fixing pins 25, the strength becomes the same as the conventional one.

  FIG. 6 is the same member structure as FIG. 4 (B), but uses a connecting hardware 11 according to the present invention. Among them, FIG. 6A uses two fixing pins 25, and FIG. 6B uses three fixing pins 25. In FIG. 6A, the breaking load is lower than in the conventional case, but in FIG. 6B, the breaking load is significantly higher than that in the conventional case. Therefore, by increasing the number of the fixing pins 25, the strength becomes the same as the conventional one.

  FIG. 7 shows a result of measuring a breaking load when a load is applied in a direction in which both the first member F and the second member S fastened by a connecting hardware are pulled apart. In each figure, the left side is a cross section in the axial direction of the first member F, the right side is a cross section in the thickness direction of the first member F, the second member S is a 240 mm × 105 mm cross section, and other major dimensions are shown in the figure. It is described in. In FIG. 7A, three fixing pins 25 are used in a connecting hardware that has been widely used. In FIG. 7B, the three fixing pins 25 are used for the connecting hardware 11 according to the present invention, but the breaking load is lower than the conventional one. However, as shown in FIG. 7C, when the four fixing pins 25 are used in the connecting hardware 11 according to the present invention, the strength is not different from the conventional one.

  FIG. 8 shows the result of measuring the breaking load when the load is applied in the direction of separating both the first member F and the second member S fastened by the connecting hardware as in FIG. However, the second member S is different in that it has a 180 mm × 105 mm cross section. In FIG. 8A, two fixing pins 25 are used in a connecting hardware that has been widely used. In FIG. 8B, the two fixing pins 25 are used for the connecting hardware 11 according to the present invention, but the breaking load is greatly reduced compared to the conventional case. However, as shown in FIG. 8 (C), when three fixing pins 25 are used in the connecting hardware 11 according to the present invention, the strength becomes close to that of the prior art.

It is a perspective view which shows the example of a shape of the connection metal fitting by this invention. It is a figure which supplements FIG. 1, (A) is the cross section of the state which assembled FIG. 1, (B) is the same longitudinal cross section, (C) is the perspective view which shows the shape of the connection metal fitting similar to FIG. FIG. It is a perspective view which shows the other example of a shape of the connection metal fitting by this invention, (A) is comprised with one insertion board and two disk shaped contact | adherence boards, (B) is T-shaped. The insertion plate extends at a right angle from the center of the contact plate. When investigating the strength of the connecting hardware according to the present invention, for comparison, the fracture load against shear when using the conventional connecting hardware is measured. Note that (A) is 240 mm in height of the second member, and (B) is 180 mm. It is the result of having measured the breaking load with respect to the shearing of the fastening part using the connection metal fitting by this invention, (A) is using three fixing pins, (B) is using four fixing pins. Yes. In addition, all the 2nd members are 240 mm x 105 mm cross sections. It is the result of having measured the breaking load with respect to the shearing of the fastening part using the connection metal fitting by this invention, (A) is using two fixing pins, (B) is using three fixing pins. Yes. In addition, all the 2nd members are 180 mm x 105 mm cross sections. It is the result of measuring the breaking load when the load is applied in the direction that separates both members in the fastening part using the connecting hardware. (A) uses three fixing pins for the conventional connecting hardware. (B) uses three fixing pins for the connecting hardware according to the present invention, and (C) uses four fixing pins for the connecting hardware according to the present invention. In addition, all the 2nd members are 240 mm x 105 mm cross sections. It is the result of measuring the breaking load when the load is applied in the direction that separates both members in the fastening part using the connecting hardware. (A) uses two fixing pins for the conventional connecting hardware. (B) uses two fixing pins for the connecting hardware according to the present invention, and (C) uses three fixing pins for the connecting hardware according to the present invention. In addition, all the 2nd members are 180 mm x 105 mm cross sections.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Connection hardware 12 Contact | adherence board 13 Insertion board 14 Echo 15 Locking hole 16 Holding groove (holding means)
17 Holding hole (holding means)
18 Contact surface 21 Bolt 22 Top portion 23 Tip portion 24 Nut 25 Fixing pin 26 Nail 31 Side hole 32 Drill hole 33 Counterbore hole 34 Recess 41 Groove 42 Pin hole 43 Step portion F First member S Second member

Claims (1)

Used in the fastening part between the first member (F) and the second member (S),
A contact plate (12) with which the contact surface (18) contacts the first member (F);
An insertion plate (13) fitted in a groove (41) formed in the second member (S) and extending at a right angle from the contact plate (12);
Consisting of
The contact plate (12) includes a locking hole (15) for fastening with the first member (F),
The insertion plate (13) includes a holding means (16 or 17) for fastening with the second member (S),
The connecting hardware characterized in that the length from the contact surface (18) of the contact plate (12) to the terminal end of the insertion plate (13) is 40 mm or more and 68 mm or less.

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